Re: [netcdf-java] [thredds] Ensemble data not possible to visualize

Hi,

I checked now also the ncss subsetter. This does not seem to have a
selector for the ensemble axis?

Heiko

On 2016-12-07 18:34, Heiko Klein wrote:
> Antonio,
> 
> thanks a lot. We will put the _CoordinateAxisType="Ensemble" while
> waiting for netcdf-java 5.0.0. Good to know that realization will be
> supported then.
> 
> IDV/netcdf and toolsUI work very well with that. Godiva displays results
> to, but ncWMS does not expose any ensemble-member dimension in the
> capabilities document. I'm not even sure if ensembles fit into the WMS
> standard, so I'm not too surprised that this does not work.
> 
> Best regards,
> 
> Heiko
> 
> 
> 
> On 2016-12-06 18:05, Antonio S. Cofiño wrote:
>> Heiko,
>>
>> Moreover....
>>
>> The netcdf-java 4.6.X recognizes the standard_name='ensemble' for
>> Ensembles Axis Type.
>>
>> https://github.com/Unidata/thredds/blob/master/cdm/src/main/java/ucar/nc2/dataset/conv/CF1Convention.java#L157-L160
>>
>>
>> but 'ensemble' is not a recognized CF standard_name. It should be
>> 'realization' as you have put into the ensemble_member
>>
>> The netcdf-java 5.0.0, adds 'realization' as possible standard_name
>> value for Ensembles Axis Type
>>
>> https://github.com/Unidata/thredds/blob/5.0.0/cdm/src/main/java/ucar/nc2/dataset/conv/CF1Convention.java#L162-L165
>>
>>
>> Regards
>>
>> Antonio
>>
>>
>> On 06/12/16 13:55, Heiko Klein wrote:
>>> Hi,
>>>
>>> we just extended our meteorology forecast runs with ensemble members.
>>>
>>> Data without ensemble/realization dimension can be found here:
>>> http://thredds.met.no/thredds/dodsC/arome25/arome_metcoop_test2_5km_latest.nc
>>>
>>> and these work well with the netcdf-java base software like
>>> thredds/idv/ncwms , e.g. precipitation_amount_acc(time,height0,y,x)
>>>
>>> As soon as we combine several realizations/ensembles into the same file
>>> http://thredds.met.no/thredds/dodsC/meps25files/meps_allmembers_full_2_5km_latest.nc
>>>
>>> all gridded feature stop working for
>>> precipitation_amount_acc(time,height0,ensemble_member,y,x). We can still
>>> use opendap, but ncwms and idv no longer find this variable.
>>> netcdf-tools still detect the variable as a FeatureType GRID
>>> f:D(5)->R(7) (in FeatureType->FeatureScan) but is not able to detect the
>>> coordinateSystem in FeatureType->Grids.
>>>
>>> I even tried to remove the height0 dimension (which is of size 1), but
>>> without any change.
>>>
>>>
>>> Is 'standard_name=realization' an unsupported feature of netcdf-java?
>>> There was a longer discussion about it in 2010:
>>> http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2010/053546.html
>>> Should we use some axis="ensemble" or _CoordinateAxis keyword to help
>>> detect the ensemble dimension?
>>>
>>> Or is the problem within thredds/ncwms/idv not able to deal with other
>>> dimensions than x,y,z,t?
>>>
>>> Sorry for cross-posting, not really sure where the problem lies. We're
>>> using thredds 4.6 and netcdf-java toolsUI 4.6
>>>
>>> Best regards,
>>>
>>> Heiko
>>>
>>>
>>
> 

-- 
Dr. Heiko Klein                   Norwegian Meteorological Institute
Tel. + 47 22 96 32 58             P.O. Box 43 Blindern
http://www.met.no                 0313 Oslo NORWAY



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